The fresh no votes have come at IP Australia, the third time workers there have rejected a proposed deal, The Australian Communications and Media Authority and interviewers at the Australian Bureau of Statistics.

The results follow recent big rejections at the giant departments of Human Services, Defence and the Australian Taxation Office ensuring the public service's industrial stalemate, already in its third year, will drag on well into 2017.

The main public sector union, the CPSU, says the government is trying to "starve" its public servants out by freezing their wages until they agree to accept the deals that are on offer and the latest round of no votes represents a failure of the strategy.

At IP Australia where the latest result came in last week, the agency's acting director Fatima Beattie said she was "disappointed" with the rejection of what she called a "good offer"

"This was a good offer with no major changes to entitlements for staff," Ms Beattie said.

"I am obviously disappointed with the result, but IP Australia is committed to getting a new agreement in place for our staff."

But the agency boss failed, narrowly, to carry the day with her workers rejecting the proposal 52 per cent o 48 per cent.

At ACMA, the defeat was more emphatic with about 62 per cent of voters rejecting the deal on offer.

The authority's acting chairman Richard Bean said he still wanted to offer the best deal possible, within the Coalition's framework.

"We remain committed to achieving a positive outcome, which is affordable and provides as attractive a package for all staff as is possible within the framework," Mr Bean said.

At the Bureau of Statistics, interviewers rejected the deal they had been offered by 70 per cent to 30 per cent.

Reacting to the latest round of no-votes, acting CPSU national secretary Alistair Waters said public servants remained determined to defend their workplace rights and conditions, despite the long-term salary freezes they had endured.

"These most recent no-votes make plain the harm the Turnbull Government's harsh public sector bargaining policy is doing to thousands of Commonwealth workers, their families and the people who rely on the services they provide," the union official said.

"This clear rejection shows staff cannot and will not accept an offers that strips away essential workplace rights and conditions, despite heading towards their third Christmas without a pay rise.

"The ABS and ACMA are the latest agencies where agreements have been rejected several times because they contain unacceptable cuts to important rights and conditions."

Mr Waters said departments and agencies had hoped to sneak agreements through before Christmas, looking for an easy end to their bargaining pain.

"Like many other Commonwealth agencies ABS and ACMA tried to rush through new agreements before Christmas," the CPSU official said.

"The Turnbull Government's 'starve them out' strategy isn't resolving bargaining but it is hurting hardworking staff and their families.

"Even where agreements are getting over the line, staff are typically voting for them in low numbers and with deep reluctance.

"As the recent Senate inquiry found, the Government's approach needs to change if this three year bargaining mess is to be resolved."